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Expressions vs regex101: catalog facts
Expressions	regex101
Paid Commercial Mac app from Apptorium; see the website for current pricing.	Freemium Free to use, with a paid Pro upgrade and enterprise option.
macOS	Web
Live preview of matches while editing Library for saving expressions	Plain-language explanation of a pattern as you type Supports PCRE2, JavaScript, Python and other flavors
macOS only Not open source	Requires a browser and internet connection Some features require a Pro upgrade
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.